adapt to new lts

[t-bltg]

• drop Requires and use only extensions;
• support only LTS (per this PSA), hence julia >= 1.10.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.39%. Comparing base (ae99e73) to head (e479702).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #391      +/-   ##
==========================================
- Coverage   99.75%   98.39%   -1.36%     
==========================================
  Files          36       36              
  Lines        2078     2062      -16     
==========================================
- Hits         2073     2029      -44     
- Misses          5       33      +28     

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